FAA 2019-19-13

Requires determining the total hours time-in-service (TIS) of the freewheel shafts of certain main rotor gearboxes (MGBs), replacing the MGB or right-hand side (RH) freewheel shaft, installing placard(s), and revising the Rotorcraft Flight Manual (RFM) for your helicopter. This AD was prompted by a report of wear of the ramps of the RH freewheel shaft.